25 incher in a P-12

[aztecgold]

I recently bought a P-12 (41) with a rod knock. After doing a little research on this site, I discovered the largest of the flathead series is the 25 inch version in 265 cid. is it possible to install the 25 inch motor from a welder into my chassis? The P-12 has the smaller head/motor, but where is the industrial motor dimensionally larger? Are the dimensional differences in the head only? Will the fan location be moved forward or the back of the head hit the firewall? It looks really close as it sits with the 23.5 inch motor in there now, so I want to get as much info as possible before I buy a 265.

Thanks.

[55 Fargo]

The 265 long block will move forward, you can make this change. I suggest you consult with and read Don Coatneys swap.

The 265 would give you more zip, thats for sure. In Canada, all Plyms, Dodges used a 25 inch engine, so the factory, had it all arranged in the cars, but not so with USA Plyms and Dodges,they used the 23.5 inch block engines.

The entire engine is longer in the 251 and 265 in the USA, In Canada 218,228,251,265 were all 25 inch long blocks, the displacement differences were created with diffferent bores,strokes, and cranks........Fred

[mackster]

I recently bought a P-12 (41) with a rod knock. After doing a little research on this site, I discovered the largest of the flathead series is the 25 inch version in 265 cid. is it possible to install the 25 inch motor from a welder into my chassis? The P-12 has the smaller head/motor, but where is the industrial motor dimensionally larger? Are the dimensional differences in the head only? Will the fan location be moved forward or the back of the head hit the firewall? It looks really close as it sits with the 23.5 inch motor in there now, so I want to get as much info as possible before I buy a 265.

Thanks.

the head and block is bigger on the 25 inch than the 23 in. If the engine is industrial aplication you can still use it in a car, but you have to add a few normal parts that the industrial wouldnt have...the 25 in long block will fit tight wit ha lil massaging. look for Don Coatney in this forum. he has done this conversion and is the proud owner of that racing car!

[aztecgold]

Thanks guys,

I did do a search using the word "industrial" as the keyword. Found some good tech.

My area is semi-rural, with a heavy agricultural influence, so finding a 265 in an implement will be easier than in a car. I went out looking today and found one in a 60's era Lincoln welder. It had some interesting parts on it, and the distributor was run off the front of the timing cover. The manifold side looked almost the same as the one in my car, but it had an updraft carburetor. I didn't want to get too close, since I hadn't spoken to the owner yet, but externally it looked clean. It also had a cast iron head with some ribbing on it. I checked Google Images to see if there was a pic of one with a similar head, but had no luck.

[greg g]

Since the position of the engine is determined by the rear motor mounts the extre length needs to be accomodated at the front. thie at a minimum means moving the radiator forward. it may also entail notching the front crossmember to make room fo the crank pully. the front motor mount also needs attending to as it moves forward, so the attachment points to the frame need to be modified. Also check the oil pan, as you may hey may be different as to where the deep part is, any you will not be able to swap over the shorter pan.

Depending on you skill level and tools, you may be able to do everthing in the garage, or may have to farm out some of the fabricating and or welding. It is not a bolt in, but its doable.

For automotive use you will probably want to find and use a downdraft intake.

[55 Fargo]

Thanks guys,

I did do a search using the word "industrial" as the keyword. Found some good tech.

My area is semi-rural, with a heavy agricultural influence, so finding a 265 in an implement will be easier than in a car. I went out looking today and found one in a 60's era Lincoln welder. It had some interesting parts on it, and the distributor was run off the front of the timing cover. The manifold side looked almost the same as the one in my car, but it had an updraft carburetor. I didn't want to get too close, since I hadn't spoken to the owner yet, but externally it looked clean. It also had a cast iron head with some ribbing on it. I checked Google Images to see if there was a pic of one with a similar head, but had no luck.

Massey 5500 and Massey 7500 combines will have them, these were made late 60s maybe to 1970 or so

[martybose]

I'm curious; did the Canadian Plymouths use a different front crossmember to accommodate the 25 inch motor? I'm intrigued by the modification that Don had to do to his car to fit the 25 inch motor.

Marty

[55 Fargo]

I'm curious; did the Canadian Plymouths use a different front crossmember to accommodate the 25 inch motor? I'm intrigued by the modification that Don had to do to his car to fit the 25 inch motor.

Marty

Hi Marty anyone witha Canadian built P15 or D25, should be able to answer this and provide pics.

Robert KB hopefuly will chime in.

Canadas smaller market necessitated having only 1 length engine, which turned out as a blessing for these car owners today,as any engine will fit, 218,228,251, 265..........

[Don Coatney]

As has been mentioned the rear engine mounts are the same. On my car I had to modify the front cross member so the vibratioin damper had clearance. I also had to reverse the radiator support bracket allowing the radiator mount to move forward two inches.

Follow this link for pictures of these modifications.

http://smg.photobucket.com/albums/v65/DonCoatney/Radiator/?start=all

I also had to modify my oil pan for tie rod clearance.

[Roadkingcoupe]

To the OP some thoughts:

- while you are looking for industrial engines keep an eye out for large Dodge truck motors...out of 2 or 3 tonne? truck. Some have the only Original Equipment Manufatured DCPD DUAL carb intake manifold!

-the rad on a 1939 Plymouth CDN (Canadian) and a US built vehicle differs in that the mounting flanges are reversed and flipped backwards....pushing the rad forward in the car by 2".....smart move Chrysler Canada.

-I can take pictures in a week or so, of the front cross member of a 1941 CDN car. Should be the same as a 1946-1948.

The difference between the US and Canadian cars has been partially documented on this forum and can be searched. Check other posts by roadkingcoupe where you will find discussions on the topic. But unquestionably Don C. is the go to guy on the subject.

Edited May 13, 2010 by Roadkingcoupe

[Roadkingcoupe]

I found this 265 Chrysler Industrial engine locally, it was on an old welder, it was used into the 1990s.

The Engine is a IND 265, a Canadian model, made in 1968, was used possibly on Massey 5200 Combine before the welder, or maybe it was new to the welder, as this is the exact engine also used on the Masey Combine.

Does anyone have any idea, what HP this engine may have, is there any problems using this in a car application?

I can get it for a $100, it is not stuck either.

Here is a pic...........Fred

search under "Canadian" or "Industrial" etc. the search function will check the whole site not just the car side.

[55 Fargo]

To the OP some thoughts:

- while you are looking for industrial engines keep an eye out for large Dodge truck motors...out of 2 or 3 tonne? truck. Some have the only Original Equipment Manufatured DCPD DUAL carb intake manifold!

-the rad on a 1939 Plymouth CDN (Canadian) and a US built vehicle differs in that the mounting flanges are reversed and flipped backwards....pushing the rad forward in the car by 2".....smart move Chrysler Canada.

-I can take pictures in a week or so, of the front cross member of a 1941 CDN car. Should be the same as a 1946-1948.

The difference between the US and Canadian cars has been partially documented on this forum and can be searched. Check other posts by roadkingcoupe where you will find discussions on the topic. But unquestionably Don C. is the go to guy on the subject.

Also the most knowledgable Chrysler Products Database Guy is Bill Watson, from Vancouver BC, originally from my hometown Winnipeg Mb.

This guy is 2nd to none on my Chrysler Corp information, that I have ever seen......

[aztecgold]

Thanks for the links to the photos. Those answered everything. Glad the rear of the motor is in the same place, so I don't need to clearance the mint firewall in my car.

My eyes are officially 'peeled' for a factory dual carb setup from a big truck! Aftermarket will work too though.

[BobT-47P15]

Here's one of those dual carb truck engines.........

It is in a larger size truck.

[Greenbomb]

Hey! I think I got a set of those air cleaners in the cupboard!

[mackster]

Hey! I think I got a set of those air cleaners in the cupboard!

are they ribbed or the cheap plain ones?